Sertoli cells are regulated by the pituitary hormone known as:

If the angles of a triangle are in the ratio $4:1:1,$ then the ratio of the longest side to the perimeter is

Identify the figure with its correct function.

Choose the correct statement$(s)$:
$(A)$ The position of the centre of mass of a system is dependent on the choice of the coordinate system.
$(B)$ Newton's second law of motion is applicable to the centre of mass of the system.
$(C)$ Internal forces cannot change the state of the centre of mass.
$(D)$ Internal forces can change the state of the centre of mass.

Which component of a lichen is heterotrophic?

The main organelle involved in the modification and routing of newly synthesized proteins to their destinations is